"Ubuntu never positioned itself as a Debian derivative, like Xandros, Mepis, or Knoppix. Ubuntu publicly acknowledges its relationship with Debian, and Canonical, through its recently founded Ubuntu foundation, hires some Debian developers. All this should be good news; but for some it's not. Whether on Distrowatch or on forums, voices whisper that Ubuntu has a dirty secret you may not want to hear: they don't keep the compatibility with Debian, and they want to fork away from their mother distribution."